docs(openspec): backfill missing proposals

openspec/changes/refactor-db-drizzle/proposal.md

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+# Change: Refactor SQLite Access with Drizzle ORM
+
+## Why
+
+Current `better-sqlite3` usage relies heavily on `any/as`, lacks unified typing and runtime validation, and increases long-term maintenance cost. Introducing Drizzle ORM provides structured schema definitions and more consistent type constraints.
+
+## What Changes
+
+- Introduce Drizzle ORM and define schema for the internal database.
+- Incrementally migrate read/write paths in `cloudHandler` and `database/handler`.
+- Preserve existing WAL, `busy_timeout`, and transaction behavior to avoid regressions.
+- Keep runtime validation and compatibility logic for the external IDE DB (`ItemTable`).
+
+## Impact
+
+- Affected code: `src/ipc/database/cloudHandler.ts`, `src/ipc/database/handler.ts`, tests, and DB utility layer
+- Affected behavior: data-access typing and runtime validation approach changes (regression validation required)